1 /* Set file access and modification times.
3 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Free Software
6 This program is free software: you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3 of the License, or any
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Written by Paul Eggert. */
21 /* derived from a function in touch.c */
36 /* Some systems (even some that do have <utime.h>) don't declare this
37 structure anywhere. */
38 #ifndef HAVE_STRUCT_UTIMBUF
46 /* Some systems don't have ENOSYS. */
49 # define ENOSYS ENOTSUP
51 /* Some systems don't have ENOTSUP either. */
52 # define ENOSYS EINVAL
57 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
58 # define __attribute__(x)
62 #ifndef ATTRIBUTE_UNUSED
63 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
66 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
67 TIMESPEC[0] and TIMESPEC[1], respectively.
68 FD must be either negative -- in which case it is ignored --
69 or a file descriptor that is open on FILE.
70 If FD is nonnegative, then FILE can be NULL, which means
71 use just futimes (or equivalent) instead of utimes (or equivalent),
72 and fail if on an old system without futimes (or equivalent).
73 If TIMESPEC is null, set the time stamps to the current time.
74 Return 0 on success, -1 (setting errno) on failure. */
77 gl_futimens (int fd ATTRIBUTE_UNUSED,
78 char const *file, struct timespec const timespec[2])
80 /* Some Linux-based NFS clients are buggy, and mishandle time stamps
81 of files in NFS file systems in some cases. We have no
82 configure-time test for this, but please see
83 <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
84 some of the problems with Linux 2.6.16. If this affects you,
85 compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
86 help in some cases, albeit at a cost in performance. But you
87 really should upgrade your kernel to a fixed version, since the
88 problem affects many applications. */
90 #if HAVE_BUGGY_NFS_TIME_STAMPS
97 /* There's currently no interface to set file timestamps with
98 nanosecond resolution, so do the best we can, discarding any
99 fractional part of the timestamp. */
100 #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
101 struct timeval timeval[2];
102 struct timeval const *t;
105 timeval[0].tv_sec = timespec[0].tv_sec;
106 timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
107 timeval[1].tv_sec = timespec[1].tv_sec;
108 timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
118 return futimesat (AT_FDCWD, file, t);
123 /* If futimesat or futimes fails here, don't try to speed things
124 up by returning right away. glibc can incorrectly fail with
125 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
126 in high security mode doesn't allow ordinary users to read
127 /proc/self, so glibc incorrectly fails with errno == EACCES.
128 If errno == EIO, EPERM, or EROFS, it's probably safe to fail
129 right away, but these cases are rare enough that they're not
130 worth optimizing, and who knows what other messed-up systems
131 are out there? So play it safe and fall back on the code
134 if (futimesat (fd, NULL, t) == 0)
137 if (futimes (fd, t) == 0)
145 #if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
149 /* Prefer EBADF to ENOSYS if both error numbers apply. */
153 int dup_errno = errno;
156 errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
162 #if HAVE_WORKING_UTIMES
163 return utimes (file, t);
166 struct utimbuf utimbuf;
167 struct utimbuf const *ut;
170 utimbuf.actime = timespec[0].tv_sec;
171 utimbuf.modtime = timespec[1].tv_sec;
177 return utime (file, ut);
182 /* Set the access and modification time stamps of FILE to be
183 TIMESPEC[0] and TIMESPEC[1], respectively. */
185 utimens (char const *file, struct timespec const timespec[2])
187 return gl_futimens (-1, file, timespec);